* Added click-select/left-right select and deselect all/invert all selection operators. For now, these basic operators will suffice (more advanced selection operators will be coded at a later stage). * Fixed a few bugs in DopeSheet found while coding the relevant tools for NLA. * Added custom border-select operator for NLA channels (since the standard one assumes negative direction channel order) * Added new API-method for NLA strips to check if the strip occurs within a given range, since this test needed to be performed in a few places... * Tweaked the NLA Editor View2D ranges a bit to give saner default sizing. This still isn't right yet though.